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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
23 November to 07 December 2015
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
The study was conducted according to an internationally recognised method, and under GLP. No deviation was reported. Test substance is adequately specified with purity. Therefore full validation applies.
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Principles of method if other than guideline:
Not applicable
GLP compliance:
yes (incl. QA statement)
Remarks:
inspected on January 22 and 23, 2013 / signed on March 22, 2013
Type of method:
effusion method: Knudsen cell
Specific details on test material used for the study:
Storage conditions of test material: 11-25 °C, dry, keep container closed.
Temp.:
20 °C
Vapour pressure:
0.13 Pa
Remarks on result:
other: interpolated
Key result
Temp.:
25 °C
Vapour pressure:
0.19 Pa
Remarks on result:
other: interpolated
Temp.:
50 °C
Vapour pressure:
1.07 Pa
Remarks on result:
other: extrapolated

Thermal Stability:

No thermal effects could be observed up to the maximum test temperature of 300 °C.

 

Effusion method: Knudsen cell

The vapour pressure was measured in the temperature range of 10 to 41 °C.

 

Table 4.6/1: Results of the Effusion method

 

No.

Temperature (°C)

Evaporation rate (kg/s)

Vapour pressure (Pa)

1

10

1.58 x 10-10

0.05

2

15

2.30 x 10-10

0.08

3

20

5.30 x 10-10

0.18

4

25

6.22 x 10-10

0.21

5

30

7.77 x 10-10

0.26

6

35

1.08 x 10-9

0.37

7

41

1.62 x 10-9

0.56

 

The vapour pressure of the test item calculated by interpolation and extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C were 0.13 (interpolated), 0.19 (interpolated) and 1.07(extrapolated) Pa, respectively.

 

Considering that the vapour pressures measured are inside the applicability domain of the method and given the good linearity of the measurements, the results are considered as valid.

Conclusions:
Low volatility (based on volatility bands criteria for occupational exposure (Chesar / ECETOC TRA), < 500 Pa).
Executive summary:

The vapour pressure of the test substance was measured under GLP according to OECD 104 / EU A4 guideline by an effusion method: Knudsen cell.

Prior to the experiment, thermal stability was checked by DSC: No thermal effects could be observed up to the maximum test temperature of 300 °C.

Seven measurements were performed in the temperature range of 10-41 °C.

 

The vapour pressure of the test item calculated by interpolation and extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C were 0.13 (interpolated), 0.19 (interpolated) and 1.07(extrapolated) Pa, respectively.

 

Description of key information

Low volatility . Results at  20, 25 and 50 °C were 0.13 (interpolated), 0.19 (interpolated) and 1.07(extrapolated) Pa, respectively.

Key value for chemical safety assessment

Vapour pressure:
0.19 Pa
at the temperature of:
25 °C

Additional information

A fully reliable experimental study, conducted according to a recognized OECD/EU method, and under GLP, is available. It is considered as a key study. The result is retained as key data.